Since this is viral, there is not much to do other than ride it out. However, if you have a fever for more than a few days, can't take in enough fluids to keep your urine dilute, or develop ANY shortness of breath, you need medical attention, and possibly hospitalization. I had a cold/flu thing a few years go while on Humira and it wound up progressing to bacterial bronchitis. Antibiotics fixed me up quickly, but I didn't need them until about 10-14 days after the bug first hit me.
Jan